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Molecular Weight Dependence of the Surface Glass Transition of Polystyrene Films Investigated by the Embedding of Gold Nanoclusters

Published online by Cambridge University Press:  17 March 2011

J. Erichsen ,
K. Günther-Schade ,
K. Dolgner ,
T. Strunskus ,
V. Zaporojtchenko  and
F. Faupel
J. Erichsen
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
K. Günther-Schade
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
K. Dolgner
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
T. Strunskus
Affiliation:
Current address: Lehrstuhl für Physikalische Chemie I, University of Bochum, Universitätsstr. 150, 44801 Bochum, Germany
V. Zaporojtchenko
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
F. Faupel*
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
*
corresponding author ff@tf.uni-kiel.de
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Abstract

We probed the glass transition temperature T g at the surface of polystyrene (PS) samples with different molecular weights by embedding of gold nanoclusters. The embedding of the nano-clusters was monitored by x-ray photoelectron spectroscopy (XPS). The onset embedding temperature determined by XPS was taken as a measure for the T g at the surface. We observed a small decrease of T g at the surface relative to the bulk for all molecular weights (ΔT g = 2.5- 8.5 K). This decrease is small for short chains (MW = 3.6 kg/mol) and grows to a saturation for M W ≥ 44 kg/mol (ΔT g ≍ 8 K). This is in accord with the smaller relative increase in the number of degrees of freedom between bulk and surface for shorter chains.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 710: Symposia DD – Polymer Interfaces and Thin Films , 2001 , DD14.5.1
Copyright
Copyright © Materials Research Society 2002

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References

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